pharmacies are well-stocked with vaccine and of course your healthcare provider. >> shepard: eastern pennsylvania, teams have set up temporary flu clinic inside these outdoor tents cut down waiting time in the emergency room. in the chicago area some hospitals went into bypass mode meaning they asked paramedics to other facilities if they could do so safely. steve brown is at a hospital in chicago. steve, is there something this year that's causing to spread? >> you bet, shep. >> last month it was responsible for a 27 full year-to-year jump in the number of confirmed cases country. the other thing about it which is very startling it is both new and powerful. >> mutated a little bit. there is a variance. our bodies are not immune to this variance. so we are seeing now increase disease, increased severity. >> bad combination. early arrival a new strain that we're not immune to. it's just a bad combination. >> shepard: sometimes they get the vaccine right. it's very effective sometimes they don't. what happened this year? >> they did get it right. they did get correctly. >> antivirus th